/Engine/Source/Editor/UnrealEd/Public/FileHelpers.h
Get the autosave filename for the given package.
static [FString](API\Runtime\Core\Containers\FString) GetAutoSaveFilename ( [UPackage](API\Runtime\CoreUObject\UObject\UPackage) *const Package, const [FString](API\Runtime\Core\Containers\FString) & AbsoluteAutosaveDir, const int32 AutoSaveIndex, const [FString](API\Runtime\Core\Containers\FString) & PackageExt )